Dean and an unlikely ally escape from Purgatory. However, Dean soon discovers that Sam has retired as a hunter. When they learn that the Prophet Kevin has escaped his captivity, the Winchesters go back to work to save him and discover that he holds the key to defeating every demon on Earth.

Crowley: Chin up, gentleman. I'm a professional.Dean: This ain't over by a long shot, Crowley.Crowley: Really, Dean, who writes your stuff? A marshmallow?

Sam: Kevin? How you holding up?Kevin Tran: Awesome. The King of Hell just snapped my girlfriend's neck. How 'bout you?

Cultural References

Dean: So you dropped your peanut butter in her chocolate.

Reese's Peanut Butter cups featured a series of ads where two people, one holding peanut butter and one holding chocolate, would bump into each other and mix their food. The result was Reese's Peanut Butter Cups, "two great tastes that taste great together."

Dean: Thirty-one flavors of bottom-dwelling nasties.

Baskin-Robbins uses the slogan "31 flavors," although they often have more at individual stores.